Use samsung milk VR. Put video in a folder called "Download" on the SD card or the phone storage. From there add _180x180_3dh to the end of the video. For example video.mp4 would be video_180x180_3dh.mp4. In the video player you can change the VR format. It's either going to be "180x180_3dh" or "180x180_3dh squished"

Could use some more horizontally split videos! Vertical splits on smartphones are out of scale... like having sex with a gigant, but maybe i just don´t know how to scale it down or i´m useing a wrong player.
Cheers to this video tho, it´s the best!!